Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “LEDs”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 469 records · Page 26

Exterior LED Lighting Projects at Princeton University

For this report, PNNL / the U.S. Department of Energy (DOE) studied a series of past exterior lighting projects at Princeton, in order to document Princeton’s experiences with solid-state lighting (SSL) and the lessons learned along the way, and to show how their approach to SSL projects evolved as their own learning expanded and as the products available improved in performance and sophistication.

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATI↗

Laser Transport Vacuum Simulations and LED Atom Tracker

MAGIS-100 uses atom interferometry to measure the distance between the Sr atoms traversing the shaft. The laser must travel through vacuum to measure accurately. Project ensures the vacuum system has low enough pressure to meet experimental requirements.

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗

Energy Saving Opportunity from Advanced LED Lighting Research

Pacific Northwest National Laboratory (PNNL) was asked by the U.S. Department of Energy (DOE) to estimate the energy saving opportunity made possible by certain lighting research planned by PNNL. This report describes the results of that effort. To complete this work, PNNL selected a methodology created for and used in the electric utility industry, called Non-Energy Benefits methodology, and a lighting market model created for DOE to estimate future energy savings potential from solid-state lighting. The study found that select planned PNNL lighting research could lead to annual energy savings of 10% of total lighting energy savings in the year 2035, or in absolute terms, 334 tBtu. Energy savings in earlier years are smaller, primarily due to the early years of low market uptake of the new technologies expected from PNNL lighting research. In 2030, annual energy savings are projected to be 4.5%, or 165 tBtu.

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATI↗

Regulatory Issues and Approaches to Municipal LED Street Lighting Conversions

Municipalities considering energy-efficient light-emitting diode street lights for their jurisdiction face a variety of regulatory issues. This brief describes how cities can successfully address these challenges to achieve multiple advantages. The brief first reviews the structure of street lighting tariffs and the costs and cost assumptions that underlie them. It then lays out pathways that municipalities can take to consider street lighting retrofits if faced by these regulatory barriers. The brief references cases of municipalities’ successes and challenges in pursuing these pathways. For more information, see the resources listed at the end of the brief.

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATI↗

Countrywide LED Lighting Retrofit for Safety, Visibility, and Energy Efficiency (Final Technical Report)

The project supported national clean energy goals by reducing electricity demand and improving energy efficiency in public infrastructure. Tasks defined in the Statement of Project Objectives included site assessments, retrofit planning, lighting design optimization, installation, monitoring, and reporting. All milestones and go/no-go decision points were successfully met.

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATI↗

Citizen-Led Community Innovation for Food Energy Water Nexus Resilience

Food-energy-water (FEW) resources are necessary for the function of multiple socio-natural systems. Understanding the synergies and trade-offs in the FEW nexus, and how these interconnections impact earth’s systems, is critical to ensure adequate access to these resources in the future; an essential component for achieving the Sustainable Development Goals (Scanlon et al., 2017). Although, over the last decade, the identification of FEW nexus complexities has increased at a global (IPCC, 2018; D’Orodico et al., 2018), national (Lant et al., 2019), and city scale (Rushforth and Ruddell, 2018), these findings are yet to be adequately translated into ‘on the ground’ action due a lack of technical and political capacity (Weitz et al., 2017). Specifically, local FEW systems have been overlooked in these analyses (Scanlon et al., 2017; Lant et al., 2019), thus leaving small and medium towns vulnerable due to a lack of data and inadequate FEW system management. Building on three years of field-tested FEW nexus research in the Ruddell Lab, we argue that participatory citizen science projects, such as our FEWSION for Community Resilience initiative, can bridge the data-policy gaps that exist within local FEW system management by: 1) providing last mile data on the FEW system, and 2) translating local data into evidence-based solutions at a grassroots level. Thus, we present a broadly applicable framework and call to action for local scale participatory citizen science to solve complex FEW nexus issues at a local, regional, and national scale.

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATI↗

Improving the efficiency of GaP LED's which emit green light

A study of techniques for preparing n-type material and junctions which yield the most consistent high diode efficiency values high lighted the role that Ga vacancies and/or associated defects play in reducing the green luminescent efficiency of n-type GaP. A useful method for obtaining good quality material was developed. It is shown that junction formation at high temperatures in a process where the n to p transition occurs without removing the substrate from the furnace yields devices superior to those obtained by diffusion or double epitaxy in the conventional manner previously used for GaP junction formation.

Ladany, I.↗

A measurement of the fast luminescent decays of the MV-50 LED.

The fast luminescent decay of the MV-50 GaAs doped Si light-emitting diode has been studied. This diode is found to provide a fast, inexpensive, bright, and convenient light source for the calibration of fast optical timing systems. A simple passive electronic module is described that allows driving the light source directly by a laboratory pulse generator.

Sutton, J. F.↗